211020312221 has 8 divisors (see below), whose sum is σ = 213031795200. Its totient is φ = 209018340432.

The previous prime is 211020312211. The next prime is 211020312259. The reversal of 211020312221 is 122213020112.

211020312221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211020312221 - 2⁶ = 211020312157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211020312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020312211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2333210 + ... + 2421963.

It is an arithmetic number, because the mean of its divisors is an integer number (26628974400).

Almost surely, 2^211020312221 is an apocalyptic number.

It is an amenable number.

211020312221 is a deficient number, since it is larger than the sum of its proper divisors (2011482979).

211020312221 is a wasteful number, since it uses less digits than its factorization.

211020312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4755595.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 211020312221 its reverse (122213020112), we get a palindrome (333233332333).

The spelling of 211020312221 in words is "two hundred eleven billion, twenty million, three hundred twelve thousand, two hundred twenty-one".